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There were thousands in use throughout the war. Most ground units changed them daily. These were called "sign" & "counter-sign" or "challenge" & "password". They were mostly determined at the local level, so I doubt that there is a list of all those that were actually used. During Operation Huskey One, the American airborne drop on Sicily, the challenge "George" was answered by the countersign "Marshall". Night drops such as Sicily and Normandy had these unique "challenge-password" combinations since the would be operating at night. In Normandy, clickers were also used with one click being answered by two clicks.

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Q: What other challenge questions besides thunder flash were used in World War 2?
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